EP1271549B1 - EEPROM Schaltung, Spannungsreferenzschaltung und Verfahren zur Besorgung eines Spannungsreferenz mit einem niedrigen Temperaturkoeffizient - Google Patents

EEPROM Schaltung, Spannungsreferenzschaltung und Verfahren zur Besorgung eines Spannungsreferenz mit einem niedrigen Temperaturkoeffizient Download PDF

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Publication number
EP1271549B1
EP1271549B1 EP01401682A EP01401682A EP1271549B1 EP 1271549 B1 EP1271549 B1 EP 1271549B1 EP 01401682 A EP01401682 A EP 01401682A EP 01401682 A EP01401682 A EP 01401682A EP 1271549 B1 EP1271549 B1 EP 1271549B1
Authority
EP
European Patent Office
Prior art keywords
voltage
eeprom
circuit
low temperature
coefficient
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP01401682A
Other languages
English (en)
French (fr)
Other versions
EP1271549A1 (de
Inventor
Eric Scott Carman
Thierry Sicard
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NXP USA Inc
Original Assignee
Freescale Semiconductor Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority to EP01401682A priority Critical patent/EP1271549B1/de
Application filed by Freescale Semiconductor Inc filed Critical Freescale Semiconductor Inc
Priority to DE60108730T priority patent/DE60108730T2/de
Priority to AT01401682T priority patent/ATE288618T1/de
Priority to PCT/EP2002/003700 priority patent/WO2003003378A1/en
Priority to KR10-2003-7002816A priority patent/KR20030093179A/ko
Priority to JP2003509463A priority patent/JP2004521573A/ja
Priority to CN02802179A priority patent/CN1465074A/zh
Priority to US10/362,467 priority patent/US6882582B2/en
Priority to TW091107183A priority patent/TW550575B/zh
Publication of EP1271549A1 publication Critical patent/EP1271549A1/de
Application granted granted Critical
Publication of EP1271549B1 publication Critical patent/EP1271549B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C16/00—Erasable programmable read-only memories
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C7/00—Arrangements for writing information into, or reading information out from, a digital store
    • G11C7/04—Arrangements for writing information into, or reading information out from, a digital store with means for avoiding disturbances due to temperature effects
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C16/00—Erasable programmable read-only memories
    • G11C16/02—Erasable programmable read-only memories electrically programmable
    • G11C16/04—Erasable programmable read-only memories electrically programmable using variable threshold transistors, e.g. FAMOS
    • G11C16/0408—Erasable programmable read-only memories electrically programmable using variable threshold transistors, e.g. FAMOS comprising cells containing floating gate transistors
    • G11C16/0441—Erasable programmable read-only memories electrically programmable using variable threshold transistors, e.g. FAMOS comprising cells containing floating gate transistors comprising cells containing multiple floating gate devices, e.g. separate read-and-write FAMOS transistors with connected floating gates
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11C—STATIC STORES
    • G11C27/00—Electric analogue stores, e.g. for storing instantaneous values
    • G11C27/005—Electric analogue stores, e.g. for storing instantaneous values with non-volatile charge storage, e.g. on floating gate or MNOS

Definitions

  • This invention relates to voltage reference circuits and particularly though not exclusively to analogue trim values in integrated circuits.
  • analogue trim values using fuses, zener zaps and EEPROMs to provide digital trim information to trim a voltage. It is also known to use EEPROMs and resistors together to store analogue trim information.
  • EEPROMs and resistors together to store analogue trim information.
  • a problem with these arrangements is that although a voltage may be trimmed precisely at a given temperature, the nature of analogue signals means that this precision is not well maintained over a range of temperatures. For an integrated circuit used in an automotive application, the operable temperature range may typically be -40°C to 125°C.
  • an EEPROM circuit for providing a low temperature-coefficient analogue trim value as claimed in claim 1.
  • the first threshold voltage is preferably programmed independently of the second threshold voltage via a switch arrangement coupled between the first and second control electrodes of the first and second EEPROM cells respectively.
  • the step of programming the threshold voltage of the control electrode of the second EEPROM cell includes the step of switching a switch arrangement coupled between the control electrodes of the first and second EEPROM cells.
  • the low temperature-coefficient voltage is preferably an analogue trim value for trimming a reference voltage.
  • low temperature-coefficient analogue trim values are provided, which are particularly beneficial when used to trim voltage values in automotive applications where an integrated circuit may have an operational temperature range of typically -40°C to 125°C.
  • FIG. 1 there is shown an illustrative circuit diagram showing an arrangement 5, including first and second EEPROM cells 10 and 20 respectively and a resistor 30.
  • the first EEPROM cell 10 has a threshold voltage VT10 and the second EEPROM cell has a threshold voltage VT20.
  • the resistor 30 develops a trim voltage VR which is the difference between the threshold voltages VT10 and VT20 of two EEPROM cells 10 and 20 respectively.
  • FIG. 2 there is shown a practical implementation 40 of the arrangement 5, in which the difference in threshold voltages between two EEPROM cells is used to trim the voltage of a band-gap reference.
  • Implementation 40 includes an EEPROM arrangement 45, a current source 70, a current mirror 80, and a bandgap reference circuit 90.
  • the EEPROM arrangement 45 has first and second EEPROM cells 50 and 60 respectively, coupled in a similar fashion to that of the arrangement 5.
  • Each of the EEPROM cells 50 and 60 respectively has source, gate and drain electrodes.
  • a switch 55 is coupled between the gate electrodes of the EEPROM cells 50 and 60 respectively, and the switch is also coupled to a programming voltage Vp to be further described below.
  • the source electrode of the first EEPROM cell 50 is coupled to ground via a resistor 65 which is arranged to develop a voltage VEE to be further described below.
  • the source electrode of the second EEPROM cell 60 is coupled directly to ground.
  • the current source 70 is coupled between a power supply voltage Vcc and the drain electrode of the second EEPROM cell 60.
  • the current mirror comprises first and second transistors 82 and 87 respectively, which each have source, gate and drain electrodes.
  • the source electrodes of the first and second transistors 82 and 87 respectively are coupled to the power supply voltage Vcc.
  • the drain electrode of the second transistor 87 is coupled to the drain electrode of the first EEPROM cell 50 of the arrangement 45, and also to the gate electrodes of both the first and second transistors 82 and 87 respectively.
  • the drain electrode of the first transistor 82 is coupled to the bandgap reference circuit in a manner to be further described below.
  • the bandgap reference circuit 90 comprises a differential amplifier 95, a bipolar transistor 96, first and second resistors 92 and 97 and a bandgap voltage source 93.
  • the differential amplifier 95 has a non-inverting input coupled to the voltage source 93, an inverting input coupled to ground via the first resistor 92 and coupled to the drain electrode of the first transistor 82 of the current mirror 80 and an output.
  • the bipolar transistor 96 has a base electrode coupled to the output of the differential amplifier 95, a collector electrode coupled to the power supply voltage Vcc and an emitter electrode coupled to the inverting input of the differential amplifier 95 via the second resistor 97, and to a reference voltage node 98, arranged to provide a reference voltage VREF.
  • the voltage VEE across resistor 65 is the difference between the thresholds of the first and second EEPROM cells 50 and 60 respectively.
  • the threshold of the second EEPROM cell 60 may be adjusted by programming using the programming voltage VP when the switch 55 is open. In this way the first EEPROM cell 50 remains unprogrammed. During normal operation of the circuit 40 the switch 55 is closed.
  • V REF V BG • R 1 + R 2 R 1 - V EE • R 2 R 3
  • the voltage VEE is scaled by resistors 97 and 65 and subtracted from a bandgap voltage VBG of the band-gap voltage source 93 (which in this example is 1.2V).
  • the band-gap voltage VBG has a low temperature coefficient (TC), but the Integrated Circuit fabrication process causes about 3.5% variation in VBG at 1 standard deviation.
  • VEE is linearly adjustable and has a low TC.
  • the circuit 40 therefore has the advantages that VEE is scaled down and therefore variation in VEE is also scaled down. Furthermore, in the case of EEPROM failure VREF returns to its untrimmed value.
  • the TC of an EEPROM cell threshold voltage is substantially independent of charge stored. In other words the TC of the EEPROM threshold remains almost exactly the same regardless of the amount of charge stored on an EEPROM gate.
  • the mean change in TC between erased and programmed states of a typical EEPROM is only 0.14mV/C.
  • VEE is scaled down by resistors R2 and R3, so that any variation in VEE will also be scaled down. Temperature accelerates charge loss.
  • the analogue trim circuit adds almost no temperature dependence to VREF.
  • the analogue trim circuit only changes the temperature dependence by 0.05mV/C.
  • At least one fundamental difference between the present invention and a prior art arrangements in which EEPROM cells are used to store trim values is that the trim value of the present invention is stored as the difference between two EEPROM thresholds rather than as the value of a single programmed EEPROM cell.
  • one advantage of the present invention for trimming voltage references is that the TC of the trim value is negligible.
  • Other known solutions using digital trim to selectively switch resistors have a high TC because the TC of resistors is high.
  • Solutions for analogue trim using single EEPROM cells have much higher TCs because the EEPROM threshold has a large TC.
  • circuit 40 is much smaller than other arrangements such as a digital trim arrangement using EEPROM cells. Trimming using an array of EEPROM cells requires a larger semiconductor area and involves high power consumption, high voltage switching circuitry.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Read Only Memory (AREA)
  • Control Of Electrical Variables (AREA)
  • Semiconductor Integrated Circuits (AREA)
  • Amplifiers (AREA)

Claims (6)

  1. EEPROM-Schaltung (45) zum Bereitstellen einer Spannung mit einem niedrigen Temperaturkoeffizienten, die erste (50) und zweite (60) EEPROM-Zellen mit ersten beziehungsweise zweiten Transistorschwellenspannungen und ersten beziehungsweise zweiten Steuerelektroden umfasst, wobei die erste und die zweite Steuerelektrode miteinander gekoppelt sind, wobei die erste Schwellenspannung unabhängig von der zweiten Schwellenspannung programmierbar ist, so dass die Spannung mit niedrigem Temperaturkoeffizienten über einen Widerstand erzeugt wird und als ein Spannungsdifferential zwischen der ersten und der zweiten Schwellenspannung zum Einstellen einer Referenzspannung zur Verfügung gestellt wird.
  2. EEPROM-Schaltung (45) nach Anspruch 1, wobei die erste Schwellenspannung unabhängig von der zweiten Schwellenspannung über eine Schalteranordnung (55) programmiert wird, die zwischen die erste und zweite Steuerelektrode der ersten (50) beziehungsweise zweiten (60) EEPROM-Zelle gekoppelt ist.
  3. Spannungsreferenzschaltung (40) mit
    der EEPROM-Schaltung (45) nach Anspruch 1 oder Anspruch 2; einer Bandlückenreferenzschaltung (90); und
    einem Stromspiegel (80), der zwischen die EEPROM-Schaltung (45) und die Bandlückenreferenzschaltung (90) zum Übertragen eines skalierten Spannungswertes an die Bandlückenreferenzschaltung (90) gekoppelt ist,
    wobei der skalierte Spannungswert ein skalierter Anteil der Spannung mit niedrigem Temperaturkoeffizienten ist.
  4. Verfahren zum Bereitstellen einer Spannung mit niedrigem Temperaturkoeffizienten, wobei das Verfahren die Schritte umfasst:
    Programmieren einer Schwellenspannung einer Steuerelektrode einer ersten EEPROM-Zelle (50) auf einem ersten Spannungsniveau; und
    Programmieren einer Schwellenspannung einer Steuerelektrode einer zweiten EEPROM-Zelle (60) auf einem zweiten Spannungsniveau, wobei die Steuerelektrode der zweiten EEPROM-Zelle (60) mit der Steuerelektrode der ersten EEPROM-Zelle (50) gekoppelt ist;
    wobei die Spannung mit niedrigem Temperaturkoeffizienten als ein Spannungsdifferential zwischen der ersten und der zweiten Schwellenspannung zur Verfügung gestellt wird.
  5. Verfahren nach Anspruch 4, wobei der Schritt zum Programmieren der Schwellenspannung der Steuerelektrode der zweiten EEPROM-Zelle (60) den Schritt zum Schalten einer Schaltungsanordnung (55) aufweist, die zwischen die Steuerelektroden der ersten (50) und der zweiten (60) EEPROM-Zelle gekoppelt ist.
  6. Schaltung oder Verfahren nach einem der vorangehenden Ansprüche, wobei die Spannung mit niedrigem Temperaturkoeffizienten ein analoger Trimmwert zum Trimmen einer Referenzspannung ist.
EP01401682A 2001-06-26 2001-06-26 EEPROM Schaltung, Spannungsreferenzschaltung und Verfahren zur Besorgung eines Spannungsreferenz mit einem niedrigen Temperaturkoeffizient Expired - Lifetime EP1271549B1 (de)

Priority Applications (9)

Application Number Priority Date Filing Date Title
DE60108730T DE60108730T2 (de) 2001-06-26 2001-06-26 EEPROM Schaltung, Spannungsreferenzschaltung und Verfahren zur Besorgung eines Spannungsreferenz mit einem niedrigen Temperaturkoeffizient
AT01401682T ATE288618T1 (de) 2001-06-26 2001-06-26 Eeprom schaltung, spannungsreferenzschaltung und verfahren zur besorgung eines spannungsreferenz mit einem niedrigen temperaturkoeffizient
EP01401682A EP1271549B1 (de) 2001-06-26 2001-06-26 EEPROM Schaltung, Spannungsreferenzschaltung und Verfahren zur Besorgung eines Spannungsreferenz mit einem niedrigen Temperaturkoeffizient
KR10-2003-7002816A KR20030093179A (ko) 2001-06-26 2002-03-29 저온 계수 전압 기준을 제공하기 위한 ｅｅｐｒｏｍ 회로전압 기준 회로 및 방법
PCT/EP2002/003700 WO2003003378A1 (en) 2001-06-26 2002-03-29 Eeprom circuit voltage reference circuit and method for providing a low temperature-coefficient voltage reference
JP2003509463A JP2004521573A (ja) 2001-06-26 2002-03-29 低温度係数電圧基準を与えるためのｅｅｐｒｏｍ回路、電圧基準回路及び方法
CN02802179A CN1465074A (zh) 2001-06-26 2002-03-29 提供低温度系数电压参考的eeprom电路、电压参考电路和方法
US10/362,467 US6882582B2 (en) 2001-06-26 2002-03-29 EEPROM circuit voltage reference circuit and method for providing a low temperature-coefficient voltage reference
TW091107183A TW550575B (en) 2001-06-26 2002-04-10 EEPROM circuit, voltage reference circuit and method for providing a low temperature-coefficient voltage reference

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP01401682A EP1271549B1 (de) 2001-06-26 2001-06-26 EEPROM Schaltung, Spannungsreferenzschaltung und Verfahren zur Besorgung eines Spannungsreferenz mit einem niedrigen Temperaturkoeffizient

Publications (2)

Publication Number Publication Date
EP1271549A1 EP1271549A1 (de) 2003-01-02
EP1271549B1 true EP1271549B1 (de) 2005-02-02

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EP01401682A Expired - Lifetime EP1271549B1 (de) 2001-06-26 2001-06-26 EEPROM Schaltung, Spannungsreferenzschaltung und Verfahren zur Besorgung eines Spannungsreferenz mit einem niedrigen Temperaturkoeffizient

Country Status (9)

Country Link
US (1) US6882582B2 (de)
EP (1) EP1271549B1 (de)
JP (1) JP2004521573A (de)
KR (1) KR20030093179A (de)
CN (1) CN1465074A (de)
AT (1) ATE288618T1 (de)
DE (1) DE60108730T2 (de)
TW (1) TW550575B (de)
WO (1) WO2003003378A1 (de)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7429888B2 (en) * 2004-01-05 2008-09-30 Intersil Americas, Inc. Temperature compensation for floating gate circuits
US7149123B2 (en) * 2004-04-06 2006-12-12 Catalyst Semiconductor, Inc. Non-volatile CMOS reference circuit
JP5168927B2 (ja) * 2007-02-14 2013-03-27 株式会社リコー 半導体装置およびそのトリミング方法
US8878511B2 (en) * 2010-02-04 2014-11-04 Semiconductor Components Industries, Llc Current-mode programmable reference circuits and methods therefor
US8680840B2 (en) * 2010-02-11 2014-03-25 Semiconductor Components Industries, Llc Circuits and methods of producing a reference current or voltage
KR101809202B1 (ko) 2012-01-31 2017-12-14 삼성전자주식회사 불휘발성 메모리 장치 및 그것의 읽기 방법
US9489004B2 (en) 2014-05-30 2016-11-08 Globalfoundries Singapore Pte. Ltd. Bandgap reference voltage generator circuits
US20170117053A1 (en) * 2015-10-27 2017-04-27 Sandisk Technologies Inc. Systems and methods to compensate for threshold voltage shifts

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4559694A (en) * 1978-09-13 1985-12-24 Hitachi, Ltd. Method of manufacturing a reference voltage generator device
US5541878A (en) * 1991-05-09 1996-07-30 Synaptics, Incorporated Writable analog reference voltage storage device
US5319370A (en) * 1992-08-31 1994-06-07 Crystal Semiconductor, Inc. Analog-to-digital converter with a continuously calibrated voltage reference
US5430670A (en) * 1993-11-08 1995-07-04 Elantec, Inc. Differential analog memory cell and method for adjusting same
JPH11154397A (ja) * 1997-11-20 1999-06-08 Nec Ic Microcomput Syst Ltd 不揮発性半導体メモリ
US5933370A (en) * 1998-01-09 1999-08-03 Information Storage Devices, Inc. Trimbit circuit for flash memory
JP2000155617A (ja) * 1998-11-19 2000-06-06 Mitsubishi Electric Corp 内部電圧発生回路

Also Published As

Publication number Publication date
ATE288618T1 (de) 2005-02-15
US20040004800A1 (en) 2004-01-08
KR20030093179A (ko) 2003-12-06
DE60108730T2 (de) 2005-07-14
EP1271549A1 (de) 2003-01-02
WO2003003378A1 (en) 2003-01-09
US6882582B2 (en) 2005-04-19
DE60108730D1 (de) 2005-03-10
CN1465074A (zh) 2003-12-31
TW550575B (en) 2003-09-01
JP2004521573A (ja) 2004-07-15

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